﻿<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>ECharts</title>
    <!-- 引入刚刚下载的 ECharts 文件 -->
    <script src="echarts.js"></script>
  </head>
  <body>
    <!-- 为 ECharts 准备一个定义了宽高的 DOM -->
    <div id="main" style="width: 700px;height:500px;"></div>
    <script type="text/javascript">
      // 基于准备好的dom，初始化echarts实例
      var myChart = echarts.init(document.getElementById('main'));

        // prettier-ignore
        let dataAxis = ['点', '击', '柱', '子', '或', '者', '两', '指', '在', '触', '屏', '上', '滑', '动', '能', '够', '自', '动', '缩', '放'];
        // prettier-ignore
        let data = [220, 182, 191, 234, 290, 330, 310, 123, 442, 321, 90, 149, 210, 122, 133, 334, 198, 123, 125, 220];
        let yMax = 500;
        let dataShadow = [];
        for (let i = 0; i < data.length; i++) {
            dataShadow.push(yMax);
        }
        option = {
            title: {
                text: '特性示例：渐变色 阴影 点击缩放',
                subtext: 'Feature Sample: Gradient Color, Shadow, Click Zoom'
            },
            xAxis: {
                data: dataAxis,
                axisLabel: {
                    inside: true,
                    color: '#fff'
                },
                axisTick: {
                    show: false
                },
                axisLine: {
                    show: false
                },
                z: 10
            },
            yAxis: {
                axisLine: {
                    show: false
                },
                axisTick: {
                    show: false
                },
                axisLabel: {
                    color: '#999'
                }
            },
            dataZoom: [
                {
                    type: 'inside'
                }
            ],
            series: [
                {
                    type: 'bar',
                    showBackground: true,
                    itemStyle: {
                        color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                            { offset: 0, color: '#83bff6' },
                            { offset: 0.5, color: '#188df0' },
                            { offset: 1, color: '#188df0' }
                        ])
                    },
                    emphasis: {
                        itemStyle: {
                            color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
                                { offset: 0, color: '#2378f7' },
                                { offset: 0.7, color: '#2378f7' },
                                { offset: 1, color: '#83bff6' }
                            ])
                        }
                    },
                    data: data
                }
            ]
        };
        // Enable data zoom when user click bar.
        const zoomSize = 6;
        myChart.on('click', function (params) {
            console.log(dataAxis[Math.max(params.dataIndex - zoomSize / 2, 0)]);
            myChart.dispatchAction({
                type: 'dataZoom',
                startValue: dataAxis[Math.max(params.dataIndex - zoomSize / 2, 0)],
                endValue:
                    dataAxis[Math.min(params.dataIndex + zoomSize / 2, data.length - 1)]
            });
        });

      // 使用刚指定的配置项和数据显示图表。
      myChart.setOption(option);
    </script>
  </body>
</html>